Hoist



N. K. SMITH June 11, 1929.

HOIST Original Filed July 25 ATTORNEY Patented June 11, 1929.

UNITED. STATES 1,716,906 PATENT OFFICE.

NELSON K. SMITH, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO BYRON JACKSON PUMP (.70., OF WEST BERKELEY, CALIFORNIA, A CORPORATION OF DELAWARE.

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.Original application filed July 25, 1925, Serial No. 46,108. Divided and this application illedflovembet 8, 1926. Serial No. 146,976.

This invention relates to hoists and the like, and more particularly to hoisting and suspending means for well apparatus, including well elevators adapted to be clamped about and to support and hold well tubing, casing, pipe rods, et cetera. It will be understood, however, that the invention pertains broadly to all kinds of hoist and suspension means in which it is desired that the suspension means may readily and with facility be disconnected from the body, device, object or implement V suspended. In well elevators this is particularly advantageous, inasmuch as the string of tubing, rods or the like may be hoisted,

lowered and allowed to hang suspended, by

means of the elevator, and to so hang sus-' pend'ed when the elevator is freed from the suspension means and rested upon the rotary table in the derrick, or upon other suitable support at or above the mouth of the well. In providing for such quick-releasable sus pension means, which will be reliable in action and convenient in manipulation and control, to prevent any failure resulting in sudden drop or fall of the load of the elevator,

. and to permit the elevator to be quickly connected up with or disconnected from the suspension means, it is highly necessary that the means for associating the suspension means and the elevator or the like shall be both simple in construction and positive in action and durable in nature and capable of resisting great or unusual stresses without misplace ment or failure to properly perform. Ordinaril such retaining means cooperate with li s or the like included in or comprising directly applied members of the suspension means, such links being suspended from the hook which in turn is suspended and operated in the d'errickbyblock and tackle elements, other members of the suspension means may be provided upon or directly connected with the elevator or other implement device. With the above and other objects in view, the invention consists in the novel and useful provision, formation, construction, association and relative arrangement of parts, mem-' bers and features, and mode ofoperation of same, all as hereinafter described, shown in the drawings, and finally pointed out in claims.

The present invention was originally disclosed and claimed in'my previously filed appending the, device *holds the gaged with the catch plication for U. S. patent for well apparatus, Serial No. 46,108, filed July 25, 1925, the present subject-matter being divided from such application.

In the drawing: Figure 1 is a side elevation of a well elevator, with parts in closed positions, and illustrating features of the improved hoist constituting the present invention, parts of the practice is provided at opposite sides of the elevator or device such as that shown in Fig; 1. In Figure 2 a spring is shown in elevation; and,

Figure 3 is aview similar to Figure 2 showing the parts in slightly altered positions or relation.

Corresponding parts in all the figures are designated by the same reference characters.

Referring with particularity to the 'drawing, the elevator or other device is provided with oppositely projecting arms, such as 19 a terminal portion 20 which co-engages with a catch head 19 which bridges the space between lateral furcations of the arm 19, when said retaining finger 20 is'in lowered or opa centering projection 20 and the pin 21, tendmg to hold the finger 20 in downwardly projecting position so that the hook portion 20" thereof may be engaged with the catch head 19' by merely pressing such hook portion 20 inwardly over the upper surface of the catch head. The link when thus retained and sushead so that it cannot be displaced until the link is somewhatlowered. The curved nose 19 on the finger 20 finger 20 en.

overlying the link produces this result. The

under surface of such-catch head is downwardly and outwardly inclined, and it will be obvious that by exerting upward and inward pressure upon said finger 20, when the link is slightly lowered, the spring 22 will be compressed and. the finger 20' may be swung outwardly with the link, opening up the space between the arm 19 and the arm It will be obvious that when the hook portion 20 is in engagement with the catch head 19' the link is positively and effectively retained in conjunction with the suspension member 19 upon the elevator or the like, and no inadvertent or accidentaldisplacement or release of the link with attendant fall or tendency to fall of the elevator can take place.

Having thus disclosed my invention, I claim and desire to secure by Letters Patent:

1. In a device as disclosed, a pair of spaced arms, a retaining finger extending between said arms and providedwith a slot, a pin in one of said arms extending through said slot, a catch head on the other of said arms, a hook portion on one end of said finger, and a spring in said slot engaging said pin and one end of said slot for holding said finger in extended position between said arms with said hook portion in engagement with said catch head, the engaging faces of said catch head and said hook portion being inclined to permit disengagement of said hook portion from said catch head upon upward and -inward movement of said finger against the tension of said spring.

2. In a well elevator, a pair of spaced arms, a retaining finger extending between said arms and provided with a slot, a pin in one of said arms extending through said slot, a catch head on the other of said arms, a hook portion on one end of said finger, a sprin in said slot engagingsaid pin and one em? of the slot for holding said finger in extended position between said arms with said hookv portion in engagement with said catch head, and a nose on sald finger 1n pos1t1on to be engaged by one of the elevator suspension links arms, means for slidably and pivotally connecting said finger to one of said arms, a catch head on the other of said arms, a hook portion on one end of said finger, means for yieldingly holding said finger in extended position between said arms with said hook portion of the finger in engagement with said catch head, and a nose on said finger in position to be engaged by one of the suspension links of the elevator for holding said hook portion of said finger in positive interlocking relation with said catch head;

In testimony whereof, I have signed my name to this specification.

NELSON K. SMITH. 

